Harry p



(No Model.)

II. P. DAVIS.

AUTOMATIC CIRCUIT BREAKER.

Patented Jan. 15, 1895.

fi a B y f A TTORNE m UNITED STATES PATENT OFFICE.

HARRY P. DAVIS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE iVEST-INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, OF SAME PLACE.

AUTOMATIC CIRCUIT-BREAKER.

S1913 CIFIIJATION forming part of Letters Patent No. 532,537, datedJanuary 15, 1895.

Application filed February 28, 1394- Serial No, 501,756. (No model.)

To all whom it may concern: 15, which is preferably provided with an in-Be it known that I, HARRY P. DAVIs,a citisulating handle 16. The upperend of the zen of the United States, residing in Pittsconducting stem isadapted to make contact burg, in the county of Allegheny and State ofwith the movable weight or knob 17, which 5 Pennsylvania, have inventeda new and useis in continual electric connection with thefullmprovementinAutomaticCircuit-Breakcasing 1. As long, therefore, asthe armature ers, (Case No. 578,) of which the following is a is held upto its place by the casing when specification. magnetized by thesolenoid 3, there will be an My invention relates to devices forautoelectric connection between the incoming to inatically interruptingelectric circuits on the binding post 13 and the casing 1, thenceoccurrence of excessive currents therein. through the solenoid and wire6 to outgoing The object of my invention is to provide a blnding post 5.device of this class which shall be easily ad- To set this device, thearmature is raised justable, and at the same time perfectly reinto theposition shown in Fig. 1, until the i5 liable in its action, and whichshall not percatch 18 is made to sustain the armature. mit maintenanceof an are at the point of The method of this support is plainly shownrupture. in the drawings. hen current is nowturned Another object of myinvention is the at on, the armature is brought into its highesttainment of portability, compactness and fireposition, the movablenature of the contact 2o proof qualities in devices of this character.piece 17 permitting considerable play. In My invention is illustrated inthe accomthis position the weight of the catch will bring panyingdrawings, whereinit into the vertical position, and the armature Figure1 is a vertical section of my device will be ready to fall upon failureof current for in a plane parallel to the suspending board, any causeinthe solenoid. The upper surface 25 and Fig. 2 is a vertical section on aplane at of the armature is preferably overlaid with 7 right angles tothe plane of section of Fig. 1. non-magnetic material to preventsticking to My circuit breaker consists of a magnetic the iron when thesolenoid is demagnetized. casing 1, within which is a restricted cham-The use of this device is two-fold. If by her 2, surrounded along agreater or less porany accident a temporary break occurs in the 30 tionof its length by a solenoid, 3. One tercurrent passing through thesolenoid, the minal is connected, as at 4:, with the magnetic armaturewill instantly drop to the position casing 1, and the other terminal isconnected shown in Fig. 2, and the local circuit in which with one ofthe binding posts, as 5, by theinthe solenoid is located, being thusbroken, sulated wire 6. Also connected electrically any translatingdevices with which it may be 35 to the binding post 5 by the Wire 7, isthe pendin circuit are protected fromsudden resumpant 8, loosely pivotedupon the insulating tion of current, which mightingure them. On standard9, or otherwise normally insulated the other hand, if, by short-circuitsor otherfrom the casing 1. wise, the current in the solenoid becomes ex-The magnetic casing 1 is provided with a cessive, the magnetization ofthe casing 1 be- 40 break 10, which causes leakage lines tending comesso high that sufficient leakage occurs more or less to attract themagnetic pendant at 10 to attract the pendant 8 into the posi- 8 intothe position shown in Fig. 1. The uption shown in Fig. 1. A shortcircuit around per end of the pendant 8 is adapted to imthe solenoid isthus provided, from the casing pinge upon the stop 11, which is madeadjustthrough the pendant and wire 7 to the bind- 5 5 able as byscrewing, as shown, and is provided ing post 5. The casing isdemagnetrzed, and with any well known means for insulating the armaturedrops, breaking the circuit at the pendant at this point from thecasing. the contact 17. If any are occurs on this The rubber cap 12 isshown as an example of breakage, it creates sudden expansion of airthese means. The current normally enters in the chamber 2,which, findingvent through mo 50 by the binding post 13, and proceeds to the theopening 19, blows out the arc.

conducting stem 14, carried by the armature It Wlll be seen that mydevice, by mclosing the break, insures absence of fire risks, and thatin every respect, a maximum of portability, compactness and convenienceis obtained.

I do not limit myself to the specific details shown and describedherein, as many obvious modifications might be made, without departingfrom the spirit of my invention.

\Vhat I claim is-- 1. In an automatic circuit breaker, a movable contactpiece and an armature for controlling the same; in combination with amagnetic body for actuating said armature and in the circuit to bebroken, and a secondary shunting armature adapted to be brought intosaid circuit by contact with said body, substantially as described.

2. In an automatic circuit breaker, a movable contact piece and anarmature for controlling the same; in combination with a solenoid and amagnetic casing surrounding the same in the circuit to be broken, and asecondary armature for shunting said solenoid, adapted to be broughtinto said circuit by contact with. said casing, substantially asdescribed.

3. In an automatic circuit-breaker, a solenoid and magnetic casingsurrounding an inner chamber, said casing being pierced with a vent forsaid chamber; in combination with a contact stem passing through saidchamber, and an armature carrying said stem,

adapted to be normally held up by said solenoid, substantially asdescribed.

4. In an automatic circuit breaker, a magnetic casing in the circuit tobe broken, and a main armature governed thereby, said casing having aleakage break, in combination with a shunting armature placed near saidbreak and adapted to be attracted into contact with said casing when theleakage across said break becomes excessive, substantially as described.

5. In an automatic circuit breaker, a magnetic casing in the circuit tobe broken, and a pendent shunting armature hanging near to but insulatedfrom said casing, in combination with an adjustable stop adapted to makecontact with said pendent armature, substantially as described.

6. In an automatic circuit breaker, the magnetic sustainer, and thearmature upheld thereby; in combination with a stop adapted to be swungunder said armature, and to swing away therefrom when the armature isdrawn fully into place by the magnet, substantially as described.

In testimony whereof I have hereunto subscribed my name this 26th day ofFebruary, A. D. 1894.

HARRY I DAVIS.

Witnesses:

JAMEs W. SMITH, HUBERT C. TENER.

